I know this is a few weeks old, but I have an 08 chevy diesel reg cab
1. Had to trim the fender behind the tire ( pro comp makes an inner fender relocation kit for about $30). Nothing done to the bumper. I also cranked the torsion bars about 1.5" more for looks/stance. No rubs whatsoever.
2. I run Goodyear duratracks (not the best for mud but fair and they're loaded with siping for wet/icy conditions), but there are numerous
3. They make several types of aftermarket tubes that go from wheelwell to wheelwell, but they will only mount in the center an front of the bar. 2 years later and mine are about an inch lower in the rear (more so on the drivers side). So u may want to fab a rear mount.